[hpsdr] Thor

[Jeroen Bastemeijer]

Hi Phil,

After a winter-sleep of Demeter ;-) , I'm catching up with the design 
process.  (The process got stuck, due to a professional work-overload.)

One of the problems I'm seeing is designing a low noise switcher with a 
smalle differenc between the input and the output. Therefor, I'm 
exploring a new concept, which consists of a first switcher which 
transforms the input voltage up to a higher voltage (range 24... 48V) 
and then converts it back to the voltages we need (5V, 12V, -12V and if 
necessary 3.3V). This higher voltage has some other advantages as well.

The nice thing is that the higher voltage could be used for a 
high-efficiency class E PA. I assume, a normal PA would run from 13.8V 
or the battery directly. However, a high effeiciency class E-amplifier, 
like Thor, needs a voltage of 40...48V. The switcher allows the use of 
Thor for mobile operation! A situation where one certainly wants to have 
a high efficiency PA.

My quick question to you is: Can you give an estimate of the voltage 
(and power) requirement of Thor?

Thank you, 73 Jeroen PE1RGE

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